CN112425226B - Communication method and corresponding user terminal and base station - Google Patents

Abstract

The disclosure provides a communication method, a corresponding user terminal and a base station. The communication method performed by the user terminal includes: receiving information on modulation and coding from a base station; and determining spreading parameters for the user terminal according to the information about the modulation and coding, wherein the spreading parameters are used for the user terminal to spread the symbols.

Description

Communication method and corresponding user terminal and base station

Technical Field

The present disclosure relates to the field of mobile communications, and more specifically to a communication method and a corresponding user terminal and base station.

Background Art

In order to improve the anti-interference capability of the communication system, it has been proposed to use an expansion factor to expand the symbol in the Non-Orthogonal Multiple Access (NOMA) system. In the NOMA system, the user terminal can encode and modulate the data bits to obtain symbols, and then expand the symbols using the expansion factor, and perform interleaving, scrambling, power allocation or resource allocation on the expanded symbols, and finally send the processed signal on the wireless resource.

In the prior art, a base station may send an expansion factor for a user terminal as part of control signaling to the user terminal so that the user terminal expands symbols according to the received expansion factor. However, in this manner, the transmission of the expansion factor causes additional signaling overhead, wasting wireless transmission resources. Therefore, a method for transmitting the expansion factor with reduced signaling overhead is needed.

Summary of the invention

According to one embodiment of the present disclosure, a communication method performed by a user terminal is provided. The method includes: receiving information about modulation and coding from a base station; and determining an extension parameter for the user terminal according to the information about modulation and coding, wherein the extension parameter is used by the user terminal to extend a symbol.

According to another embodiment of the present disclosure, a communication method performed by a base station is provided. The method includes: determining information about modulation and coding for a user terminal; and sending the information about modulation and coding to the user terminal so that the user terminal determines an extension parameter according to the information about modulation and coding, wherein the extension parameter is used by the user terminal to extend a symbol.

According to another embodiment of the present disclosure, a user terminal is provided, comprising: a receiving unit configured to receive information about modulation and coding from a base station; and a determining unit configured to determine an extended parameter for the user terminal based on the information about modulation and coding, wherein the extended parameter is used by the user terminal to extend symbols.

According to another embodiment of the present disclosure, a base station is provided, comprising: a determination unit, configured to determine information about modulation and coding for a user terminal; and a sending unit, configured to send the information about modulation and coding to the user terminal, so that the user terminal determines an extension parameter based on the information about modulation and coding, wherein the extension parameter is used by the user terminal to extend symbols.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other purposes, features and advantages of the present disclosure will become more apparent by describing the embodiments of the present disclosure in more detail in conjunction with the accompanying drawings. The accompanying drawings are used to provide a further understanding of the embodiments of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the present disclosure and do not constitute a limitation of the present disclosure. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

FIG. 1 is a flowchart of a communication method performed by a user terminal according to an embodiment of the present disclosure.

FIG. 2 is a flowchart of a method for determining a first table according to a modulation parameter, a coding parameter, and a candidate extension parameter according to an embodiment of the present disclosure.

FIG3 is a flowchart of a communication method performed by a base station according to an embodiment of the present disclosure.

FIG. 4 is a block diagram of a user terminal for executing the method shown in FIG. 1 according to an embodiment of the present disclosure.

FIG. 5 is a block diagram of a base station for executing the method shown in FIG. 3 according to an embodiment of the present disclosure.

FIG. 6 is a schematic diagram of a hardware structure of a communication device according to an embodiment of the present disclosure.

DETAILED DESCRIPTION

In order to make the objectives, technical solutions and advantages of the present disclosure more obvious, exemplary embodiments according to the present disclosure will be described in detail below with reference to the accompanying drawings.

First, a method for a user terminal to determine an extended parameter based on information about modulation and coding is described with reference to FIG1. FIG1 is a flow chart of a communication method 100 performed by a user terminal according to an embodiment of the present disclosure. Since modulation, coding, and extension are all data processing operations in communication, the extended parameters for the user terminal can be indicated by information about modulation and coding, without the need to send the extended parameters to the user terminal as part of the control signaling, thereby reducing signaling overhead and saving wireless resources.

As shown in FIG1 , in step S101, the user terminal receives information about modulation and coding from the base station. The information about modulation may include modulation parameters that the user terminal can use, such as a modulation order or a modulation mode. The information about coding may include coding parameters that the user terminal can use, such as a coding rate or a target coding rate. The information about modulation and coding may be information for indicating modulation and coding, such as index information of a modulation and coding scheme (MCS).

According to an example of the present disclosure, the value of the MCS index may be a natural number, such as a natural number greater than or equal to 0 and less than or equal to 31. It should be understood that the value of the MCS index is not limited to a natural number, and may also be a positive integer, such as a positive integer greater than or equal to 1 and less than or equal to 32.

Then, in step S102, the user terminal determines an extension parameter for the user terminal according to the information about modulation and coding, wherein the extension parameter is used by the user terminal to extend the symbol. By extending the symbol, a single symbol can be extended into one or more identical symbols, thereby enhancing the anti-interference capability of the user terminal.

According to an example of the present disclosure, the spreading parameter in step S102 may be a spreading factor. For example, the value of the spreading parameter may be 1, 2 or 4. It should be understood that the value of the spreading parameter is not limited to 1, 2 or 4, but may also be other positive integers.

According to another example of the present disclosure, the user terminal may determine the modulation parameters and coding parameters used for the user terminal based on the information about modulation and coding. For example, the user terminal may receive the index information of the MCS from the base station to determine the available modulation parameters and coding parameters, rather than receiving the specific modulation parameters and coding parameter information from the base station. For example, the user terminal and the base station may pre-negotiate multiple MCS indexes and the modulation parameters and coding parameters corresponding to each MCS index. In this case, the user terminal may determine the modulation parameters and coding parameters corresponding to the MCS index based on the MCS index information received from the base station.

According to another example of the present disclosure, the user terminal may also determine the spectrum efficiency for the user terminal based on the information about modulation and coding. For example, the user terminal may receive the index information of the MCS from the base station to determine the spectrum efficiency, instead of obtaining the specific value of the spectrum efficiency from the base station.

Through the above examples of the present disclosure, the user terminal can determine the modulation parameters, coding parameters, extension parameters and spectral efficiency used for the user terminal based on the information about modulation and coding received from the base station, so that the user terminal uses the modulation parameters and coding parameters to encode and modulate the data bits to obtain symbols, and uses the extension parameters to extend the symbols, and at the same time obtains the corresponding spectral efficiency under the modulation parameters, coding parameters and extension parameters.

How the user terminal determines the extended parameters for the user terminal according to the information about the modulation and coding in step S102 will be described below. According to an example of the present disclosure, in step S102, the user terminal may determine the extended parameters for the user terminal according to the index of the modulation and coding strategy and a first table, the first table including a plurality of indexes and an extended parameter corresponding to each index.

According to an example of the present disclosure, in addition to multiple indexes and extended parameters corresponding to each index, the first table may also include one or more of a modulation parameter, a coding parameter, and a spectral efficiency corresponding to each index. For example, the spectral efficiency for the user terminal may be determined based on the modulation parameter, the coding parameter, and the extended parameter for the user terminal. For example, the spectral efficiency of the present disclosure may be calculated based on the modulation parameter, the coding parameter, and the extended parameter for the user terminal in a conventional manner of calculating the spectral efficiency.

In the present disclosure, the user terminal may store a first table including only a plurality of indexes and an extended parameter corresponding to each index. Alternatively, the user terminal may also store a first table including a plurality of indexes and an extended parameter corresponding to each index and also including one or more of a modulation parameter, a coding parameter, and a spectral efficiency corresponding to each index.

In addition, according to an example of the present disclosure, the first table may be determined according to modulation parameters, coding parameters, and candidate extension parameters. The method for determining the first table according to modulation parameters, coding parameters, and candidate extension parameters is described below with reference to FIG. 2. FIG. 2 is a flowchart of a method 200 for determining the first table according to modulation parameters, coding parameters, and candidate extension parameters according to an embodiment of the present disclosure.

As shown in FIG2 , in step S201, a spectrum efficiency set is determined according to modulation parameters, coding parameters and candidate extension parameters. For example, the modulation parameters and coding parameters in step S201 may be M candidate modulation parameters and candidate coding parameters, and the candidate extension parameters in step S201 may be N candidate extension parameters, where M and N are both positive integers. Since there are M possibilities for modulation parameters and coding parameters and N possibilities for candidate extension parameters, the spectrum efficiency set may include M×N elements.

Then, in step S202, a predetermined number of spectrum efficiencies may be selected from the spectrum efficiency set. In the present disclosure, the predetermined number may be represented by K, and K is a positive integer. For example, the user terminal may select the minimum or relatively small spectrum efficiency corresponding to the predetermined number from the spectrum efficiency set, so that the user terminal suffers less interference in the scenario of small data packet transmission, thereby improving the communication quality of the user terminal. An example in which the user terminal selects the minimum and relatively small spectrum efficiency corresponding to the predetermined number from the spectrum efficiency set will be specifically described below.

According to an example of the present disclosure, a minimum spectral efficiency corresponding to a predetermined number may be selected from a spectral efficiency set. For example, in step S202, the elements (i.e., spectral efficiencies) in the spectral efficiency set may be sorted in ascending order, and then the minimum spectral efficiency corresponding to the predetermined number may be selected from the sorted multiple spectral efficiencies. For example, M×N spectral efficiencies may be sorted in ascending order to obtain sorted M×N spectral efficiencies, and then the first K spectral efficiencies may be selected from the sorted M×N spectral efficiencies as the predetermined number of spectral efficiencies, that is, the 1st, ..., i, ...K spectral efficiencies among the sorted M×N spectral efficiencies may be selected as the predetermined number of spectral efficiencies, where 1≤i≤K and is a positive integer.

It should be understood that, although the above example sorts multiple spectral efficiencies in order from small to large, the present disclosure is not limited thereto. According to another example of the present disclosure, multiple spectral efficiencies may also be sorted in order from large to small, and then the smallest spectral efficiency corresponding to the predetermined number is selected from the sorted multiple spectral efficiencies. For example, the M×N spectral efficiencies may be sorted in order from large to small to obtain the sorted M×N spectral efficiencies, and then the last K spectral efficiencies are selected from the sorted M×N spectral efficiencies as the predetermined number of spectral efficiencies, that is, the (M×N-K+1), (M×N-K+2), ..., i, (M×N-1), ..., (M×N)th spectral efficiencies among the sorted M×N spectral efficiencies are selected as the predetermined number of spectral efficiencies, where (M×N-K+1)≤i≤(M×N) and is a positive integer.

The above example describes selecting the minimum spectral efficiency corresponding to a predetermined number from a spectral efficiency set, but the present disclosure is not limited to this. According to another example of the present disclosure, a relatively small, predetermined number of spectral efficiencies can be selected from the spectral efficiency set. For example, in step S202, the elements in the spectral efficiency set (i.e., the spectral efficiencies) can be sorted in order from small to large, and then a relatively small spectral efficiency corresponding to a predetermined number is selected from the sorted multiple spectral efficiencies at a predetermined interval. In the present disclosure, the predetermined interval can be a positive integer. Two examples with a predetermined interval of 1 are given below.

For example, the M×N spectral efficiencies may be first sorted in ascending order to obtain sorted M×N spectral efficiencies, and then the 1st, 3rd, ..., i, ..., (2K-1)th spectral efficiencies may be selected from the sorted M×N spectral efficiencies as a predetermined number of spectral efficiencies, where 1≤i≤(2K-1) and is an odd number.

For another example, the M×N spectral efficiencies may be first sorted in ascending order to obtain sorted M×N spectral efficiencies, and then the 2nd, 4th, ..., i, ..., 2K spectral efficiencies may be selected from the sorted M×N spectral efficiencies as a predetermined number of spectral efficiencies, where 2≤i≤2K and is an even number.

It should be understood that although the above example sorts the multiple spectral efficiencies in descending order, the present disclosure is not limited thereto. According to another example of the present disclosure, the multiple spectral efficiencies may also be sorted in descending order, and then a relatively small spectral efficiency corresponding to a predetermined number is selected from the sorted multiple spectral efficiencies at predetermined intervals.

Then, in step S203, multiple extended parameters included in the first table may be obtained according to the candidate extended parameters corresponding to the predetermined number of spectrum efficiencies to determine the first table. For example, the MCS indexes corresponding to the predetermined number of spectrum efficiencies may be renumbered to obtain multiple indexes included in the first table; and the candidate extended parameters corresponding to the predetermined number of spectrum efficiencies may be determined as the multiple extended parameters included in the first table.

The above method 200 is described again below with reference to Tables 1-6, taking M=32, N=3, and K=29 as an example. For example, in step S201, a spectrum efficiency set including 87 spectrum efficiencies is determined according to 32 modulation orders and coding parameters and 3 candidate extension parameters. In step S202, 29 spectrum efficiencies may be selected from the spectrum efficiency set. In step S203, a first table may be determined according to the candidate extension parameters corresponding to the 29 spectrum efficiencies to determine the multiple extension parameters included in the first table.

Table 1 below shows an example of a spectrum efficiency set obtained by step S201. The elements in the spectrum efficiency set may be the spectrum efficiencies listed in the spectrum efficiency column in Table 1. As shown in Table 1, the MCS index may be represented by I _MCS , and the value may be a natural number from 0 to 31; the modulation order corresponding to each MCS index may be represented by Q _m ; and the coding rate corresponding to each MCS index may be represented by R. In Table 1, the coding rate R may be a quantized value of the actual coding rate r, such as a value obtained by multiplying the actual coding rate r by 1024. In addition, in Table 1, the value of the expansion factor may be 1, 2, or 4. For a given MCS index, modulation order, and coding rate, when the expansion factor is 1, 2, and 4, respectively, three different spectrum efficiencies may be generated.

Table 1 Examples of spectral efficiency sets

Table 2 below shows an example of the minimum 29 spectral efficiencies obtained by step 202. The 29 spectral efficiencies in Table 2 are the 1st, 2nd, ..., 29th spectral efficiencies selected from the 87 spectral efficiencies after sorting them from small to large. For example, after selecting the minimum 29 spectral efficiencies from the 87 spectral efficiencies, the minimum 29 spectral efficiencies can be filled in the spectral efficiency column (i.e., the 5th column) in order from small to large, and then the MCS index and expansion factor corresponding to the 29 spectral efficiencies can be filled in the MCS index column (i.e., the 1st column) and the expansion factor column (i.e., the 4th column), respectively. At the same time, the modulation order and coding rate corresponding to the MCS index can also be filled in the modulation order column (i.e., the 2nd column) and the coding rate column (i.e., the 3rd column), respectively. In this way, Table 2 below is determined.

Table 2 Examples of selected spectral efficiencies

Table 3 below shows an example of the first table determined by step S203. Table 3 corresponds to Table 2 described above. After renumbering the MCS indexes in Table 2, Table 3 can be obtained, that is, the first table is determined.

Table 3 Example of the first table

In addition, the following Table 4 shows an example of 29 relatively small spectral efficiencies obtained by step 202. The 29 spectral efficiencies in Table 4 are the 1st, 3rd, ..., ..., 57th spectral efficiencies selected from the 87 spectral efficiencies after sorting them from small to large. For example, after sorting the 87 spectral efficiencies from small to large, the 1st, 3rd, ..., 57th spectral efficiencies can be selected and filled in the spectral efficiency column (i.e., the 5th column) in order from small to large, and then the MCS index and expansion factor corresponding to the 29 spectral efficiencies are filled in the MCS index column (i.e., the 1st column) and the expansion factor column (i.e., the 4th column) respectively. At the same time, the modulation order and coding rate corresponding to the MCS index can also be filled in the modulation order column (i.e., the 2nd column) and the coding rate column (i.e., the 3rd column) respectively. In this way, the following Table 4 is determined.

Table 4 Another example of selected spectrum efficiency

Table 5 below shows another example of the first table determined by step S203. Table 5 corresponds to Table 4 described above. After renumbering the MCS indexes in Table 4, Table 5 can be obtained, that is, the first table is determined.

Table 5 Example of the first table

Furthermore, as described above, the first table may include only a plurality of indexes and an extended parameter corresponding to each index. Table 6 below shows an example of a first table including only a plurality of indexes and an extended parameter corresponding to each index.

Table 6 Another example of the first table

The above describes an example of determining the first table according to the modulation parameter, the coding parameter and the candidate extension parameter in combination with FIG. 2 and Tables 1-6. According to another example of the present disclosure, the first table may be obtained by improving a predetermined MCS table, and the predetermined MCS table may include an MCS index and a modulation parameter, a coding parameter and a spectrum efficiency corresponding to the MCS index. The predetermined MCS table may be, for example, an MCS table determined by a 3GPP standard specification (e.g., 3GPP TS 38.214).

According to an example of the present disclosure, an extended parameter for a user terminal can be determined based on a coding parameter for the user terminal in an MCS table. For example, the extended parameter for the user terminal can be determined by comparing the coding parameter for the user terminal with a coding parameter threshold. For example, when the coding rate for the user terminal is less than or equal to a first coding rate threshold, the extended factor for the user terminal can be set to a first extended factor; when the coding rate for the user terminal is greater than the first coding rate threshold and less than or equal to a second coding rate threshold, the extended factor for the user terminal can be set to a second extended factor; and when the coding rate for the user terminal is greater than the second coding rate threshold and less than a maximum coding rate threshold, the extended factor for the user terminal can be set to a third extended factor.

For example, the value of the first coding rate threshold may be 237, and the value of the first expansion factor may be 4; the value of the second coding rate threshold may be 474, and the value of the second expansion factor may be 2; and the value of the maximum coding rate threshold may be 948, and the value of the third expansion factor may be 1. These values are determined taking into account that the current 3GPP has stipulated the maximum value of the actual coding rate r, that is, the actual coding rate r≤948/1024, and the target coding rate R＜(948/1024×1024＝948). Therefore, the maximum value of R can be determined to be 948.

In this example, after the extended parameters for the user terminal are determined according to the coding parameters for the user terminal, the extended parameters for the user terminal may be added to the MCS table to generate a first table.

Through the above example, the user terminal can obtain the extended parameters for the user terminal by querying the first table, so as to use the queried extended parameters to extend the symbol. However, the present invention is not limited to this. According to another example of the present disclosure, the user terminal may not add the extended parameters of the user terminal to the MCS table to generate the first table. For example, the user terminal can determine the coding parameters corresponding to the MCS index according to the received MCS index, and then determine the extended parameters for the user terminal by comparing the coding parameters and the coding parameter threshold, and use the determined extended parameters to extend the symbol.

In addition, according to an example of the present disclosure, after the extended parameter for the user terminal is determined according to the coding parameter for the user terminal, the coding parameter for the user terminal can also be updated according to the extended parameter for the user terminal, so that the spectrum efficiency is kept unchanged before and after the extended parameter is added. For example, the extended factor for the user terminal and the original coding rate for the user terminal can be multiplied to obtain the current coding rate for the user terminal, and the original coding rate can be updated using the current coding rate for the user terminal.

For example, when the expansion factor is 4, the original coding rate can be updated to 4 times the original coding rate, that is, the current coding rate is 4 times the original coding rate; when the expansion factor is 2, the original coding rate can be updated to 2 times the original coding rate, that is, the current coding rate is 2 times the original coding rate; and when the expansion factor is 1, the original coding rate may not be updated, that is, the current coding rate is the same as the original coding rate. In this way, it can be ensured that the spectrum efficiency for the user terminal does not change, reducing the impact on the transmission block size for the user terminal. In this case, the first table can include the updated coding rate.

In addition, in this example, the communication device may store only the first table, and no longer store the existing MCS table. Alternatively, the communication device may store the MCS index of the first table and the extended parameter corresponding to the MCS index, while also storing the existing MCS table.

The following describes an example of obtaining a first table by improving the existing MCS table using M=32, N=3, K=29 in conjunction with Table 7. Table 7 below shows another example of the first table. Compared with the existing MCS table, Table 7 below adds extended parameters and updates coding parameters.

Table 7 Another example of the first table

In addition, the method for determining the first table described above can be executed by a communication device, such as a base station, a user terminal, etc. In this case, the communication device can store the determined first table after executing the method for determining the first table. However, the present disclosure is not limited to this. In another example of the present disclosure, the method for determining the first table can also be executed by a core network device. In this case, the core network device can notify the base station or the user terminal of the determined first table, and then the base station or the user terminal stores the first table. In addition, in another example of the present disclosure, the method for determining the first table may not be executed by the communication device or the core network device, but may be executed by the manufacturer before the communication device or the core network device leaves the factory. In this case, the first table may be a table that has been stored inside the communication device when the communication device leaves the factory.

In addition, according to an example of the present disclosure, the method 100 may further include: determining a transport block size for a user terminal according to information about modulation and coding and an extended parameter for the user terminal. For example, a modulation parameter, a coding parameter, and an extended parameter for the user terminal may be determined according to information about modulation and coding, and then a transport block size for the user terminal may be determined according to the modulation parameter, the coding parameter, and the extended parameter for the user terminal. For example, an intermediate value N _info of the transport block size of the user terminal may be calculated by the following formula (1):

N _info ＝N _RE *R*Q _m *υ/s (1)

Wherein, N _RE represents the number of REs used for the user terminal, R represents the coding rate used for the user terminal, Q _m represents the modulation order used for the user terminal, v represents the number of data streams used for the user terminal, and s represents the spreading factor used for the user terminal.

After the intermediate value N _info is calculated according to the above formula (1), the transport block size for the user terminal may be calculated according to the calculation method specified in the existing 3GPP standard specification.

Through the method executed by the user terminal of this embodiment, the user terminal can determine the expansion factor used for the user terminal based on the information about modulation and coding received from the base station, without the base station sending the expansion factor to the user terminal as part of the control signaling, thereby reducing signaling overhead and saving wireless transmission resources.

Next, a communication method on the base station side corresponding to the method 100 shown in FIG1 according to an embodiment of the present disclosure is described with reference to FIG3. FIG3 is a flow chart of a communication method 300 performed by a base station according to an embodiment of the present disclosure. Since the method 300 is the same in details as the method 100 described above with reference to FIG1, a detailed description of the same contents is omitted here for simplicity.

As shown in Fig. 3, in step S301, the base station determines modulation and coding information for the user terminal. The modulation and coding information may be information for indicating modulation and coding, such as index information of a modulation and coding scheme (MCS).

According to an example of the present disclosure, the MCS may be determined by the base station according to the wireless channel condition between the user terminal and the base station. For example, the MCS may be determined by the base station according to the channel quality indicator (Channel Quality Indication, CQI) reported by the user terminal. For another example, the MCS may be determined by the base station according to the CQI obtained by measuring the uplink reference signal, and the uplink reference signal may be, for example, a demodulation reference signal (Demodulation Reference Signal, DMRS), a sounding reference signal (Sounding Reference Signal, SRS), etc.

Then, in step S302, the base station sends the information about modulation and coding to the user terminal, so that the user terminal determines an extension parameter according to the information about modulation and coding, wherein the extension parameter is used by the user terminal to extend symbols.

According to an example of the present disclosure, the base station may send information about modulation and coding to the user terminal through RRC signaling, DCI or MAC CE, etc. Accordingly, the user terminal may obtain information about modulation and coding by receiving RRC signaling, DCI or MAC CE from the base station, so that the user terminal determines the extended parameters according to the information about modulation and coding.

Through the method executed by the base station in this embodiment, the user terminal can determine the expansion factor used for the user terminal based on the information about modulation and coding received from the base station, without the base station sending the expansion factor to the user terminal as part of the control signaling, thereby reducing signaling overhead and saving wireless transmission resources.

Next, a user terminal that executes the method 100 shown in FIG1 according to an embodiment of the present disclosure is described with reference to FIG4. FIG4 shows a block diagram of a user terminal 400 according to an embodiment of the present disclosure. Since the functions of the user terminal 400 are the same as the details of the method 100 described above with reference to FIG1, a detailed description of the same contents is omitted here for simplicity.

As shown in Figure 4, the user terminal 400 includes a receiving unit 410, which is configured to receive information about modulation and coding from a base station; and a determining unit 420, which is configured to determine an extension parameter for the user terminal according to the information about modulation and coding, wherein the extension parameter is used by the user terminal to extend a symbol. The user terminal 400 may also include other units in addition to the above two units, but since these units are irrelevant to the present disclosure, the description of these units is omitted.

According to an example of the present disclosure, the determination unit 420 may determine the modulation parameters and coding parameters for the user terminal based on the information about modulation and coding. For example, the user terminal may receive index information of the MCS from the base station to determine the available modulation parameters and coding parameters, rather than receiving specific modulation parameters and coding parameter information from the base station.

According to another example of the present disclosure, the determination unit 420 may also determine the spectrum efficiency for the user terminal based on the information about modulation and coding. For example, the user terminal may receive the index information of the MCS from the base station to determine the spectrum efficiency instead of obtaining the specific value of the spectrum efficiency from the base station.

Through the above examples of the present disclosure, the user terminal can determine the modulation parameters, coding parameters, extension parameters and spectral efficiency used for the user terminal based on the information about modulation and coding received from the base station, so that the user terminal uses the modulation parameters and coding parameters to encode and modulate the data bits to obtain symbols, and uses the extension parameters to extend the symbols, and at the same time obtains the corresponding spectral efficiency under the modulation parameters, coding parameters and extension parameters.

How the determination unit 420 determines the extended parameters for the user terminal according to the information about the modulation and coding will be described below. According to an example of the present disclosure, the determination unit 420 may determine the extended parameters for the user terminal according to the index of the modulation and coding strategy and a first table, the first table including a plurality of indexes and an extended parameter corresponding to each index.

According to an example of the present disclosure, in addition to multiple indexes and extended parameters corresponding to each index, the first table may also include one or more of a modulation parameter, a coding parameter, and a spectral efficiency corresponding to each index. For example, the spectral efficiency for the user terminal may be determined based on the modulation parameter, the coding parameter, and the extended parameter for the user terminal. For example, the spectral efficiency of the present disclosure may be calculated based on the modulation parameter, the coding parameter, and the extended parameter for the user terminal in a conventional manner of calculating the spectral efficiency.

In addition, according to an example of the present disclosure, the first table may be determined according to the modulation parameters, the coding parameters, and the candidate extension parameters. For example, the determination unit 420 may determine the spectral efficiency set according to the modulation parameters, the coding parameters, and the candidate extension parameters. For example, the modulation parameters and the coding parameters here may be M candidate modulation parameters and candidate coding parameters, and the candidate extension parameters here may be N candidate extension parameters, where M and N are both positive integers. Since there are M possibilities for the modulation parameters and the coding parameters, and N possibilities for the candidate extension parameters, the spectral efficiency set may include M×N elements.

Then, the determination unit 420 may select a predetermined number of spectrum efficiencies from the spectrum efficiency set. In the present disclosure, the predetermined number may be represented by K, and K is a positive integer. For example, the user terminal may select the minimum or relatively small spectrum efficiency corresponding to the predetermined number from the spectrum efficiency set, so that the user terminal suffers less interference in the scenario of small data packet transmission, thereby improving the communication quality of the user terminal.

Then, the determination unit 420 may obtain the multiple extended parameters included in the first table according to the candidate extended parameters corresponding to the predetermined number of spectrum efficiencies to determine the first table. For example, the MCS indexes corresponding to the predetermined number of spectrum efficiencies may be renumbered to obtain the multiple indexes included in the first table; and the candidate extended parameters corresponding to the predetermined number of spectrum efficiencies may be determined as the multiple extended parameters included in the first table.

According to another example of the present disclosure, the first table may be obtained by improving a predetermined MCS table, and the predetermined MCS table may include an MCS index and a modulation parameter, a coding parameter, and a spectral efficiency corresponding to the MCS index. The predetermined MCS table may be, for example, an MCS table determined by a 3GPP standard specification (e.g., 3GPP TS 38.214).

According to an example of the present disclosure, the extended parameters for the user terminal may be determined according to the coding parameters for the user terminal in the MCS table. For example, the extended parameters for the user terminal may be determined by comparing the coding parameters for the user terminal with a coding parameter threshold.

In this example, after the extended parameters for the user terminal are determined according to the coding parameters for the user terminal, the extended parameters for the user terminal may be added to the MCS table to generate a first table.

In addition, according to an example of the present disclosure, after the extended parameters for the user terminal are determined based on the coding parameters for the user terminal, the coding parameters for the user terminal can also be updated based on the extended parameters for the user terminal so that the spectral efficiency remains unchanged before and after the extended parameters are added.

In addition, according to an example of the present disclosure, the determination unit 420 may also be configured to determine the transport block size for the user terminal according to the information about modulation and coding and the extended parameters for the user terminal. For example, the modulation parameter, coding parameter and extended parameter for the user terminal may be determined according to the information about modulation and coding, and then the transport block size for the user terminal may be determined according to the modulation parameter, coding parameter and extended parameter for the user terminal.

Through the user terminal of this embodiment, the user terminal can determine the expansion factor used for the user terminal based on the information about modulation and coding received from the base station, without the base station sending the expansion factor to the user terminal as part of the control signaling, thereby reducing signaling overhead and saving wireless transmission resources.

Next, a base station that executes the method 300 shown in FIG3 according to an embodiment of the present disclosure is described with reference to FIG5. FIG5 shows a block diagram of a base station 500 according to an embodiment of the present disclosure. Since the functions of the base station 500 are the same as the details of the method 300 described above with reference to FIG3, a detailed description of the same contents is omitted here for simplicity.

As shown in Figure 5, the base station 500 includes a determining unit 510, which is configured to determine information about modulation and coding for a user terminal; and a sending unit 520, which is configured to send the information about modulation and coding to the user terminal, so that the user terminal determines an extension parameter according to the information about modulation and coding, wherein the extension parameter is used by the user terminal to extend a symbol. The base station 500 may also include other units in addition to the above two units, but since these units are irrelevant to the present disclosure, the description of these units is omitted.

According to an example of the present disclosure, the information about modulation and coding may be information for indicating modulation and coding, such as index information of a modulation and coding scheme (MCS). The MCS may be determined by the base station according to the wireless channel condition between the user terminal and the base station. For example, the MCS may be determined by the base station according to a channel quality indicator (Channel Quality Indication, CQI) reported by the user terminal. For another example, the MCS may be determined by the base station according to a CQI obtained by measuring an uplink reference signal, and the uplink reference signal may be, for example, a demodulation reference signal (Demodulation Reference Signal, DMRS), a sounding reference signal (Sounding Reference Signal, SRS), etc.

According to an example of the present disclosure, the sending unit 520 may send information about modulation and coding to the user terminal through RRC signaling, DCI or MAC CE, etc. Accordingly, the user terminal may obtain information about modulation and coding by receiving RRC signaling, DCI or MAC CE from the base station, so that the user terminal determines the extended parameter according to the information about modulation and coding.

Through the base station of this embodiment, the user terminal can determine the expansion factor used for the user terminal based on the information about modulation and coding received from the base station, without the base station sending the expansion factor to the user terminal as part of the control signaling, thereby reducing signaling overhead and saving wireless transmission resources.

<Hardware Structure>

In addition, the block diagram used in the description of the above-mentioned embodiment shows a block in a function unit. These function blocks (structural units) are implemented by any combination of hardware and/or software. In addition, the implementation means of each function block is not particularly limited. That is, each function block can be implemented by a device that is physically and/or logically combined, or two or more devices that are physically and/or logically separated can be directly and/or indirectly (for example, by wired and/or wireless) connected to be implemented by the above-mentioned multiple devices.

For example, a wireless base station, a user terminal, etc. in one embodiment of the present invention may function as a computer that executes the processing of the wireless communication method of the present invention. FIG6 is a diagram showing an example of the hardware structure of a wireless base station and a user terminal involved in one embodiment of the present invention. The user terminal 400 or the base station 500 described above may be configured as a computer device that physically includes a processor 610, a memory 620, a storage 630, a communication device 640, a bus 650, etc.

In addition, in the following description, the word "device" may also be replaced by circuit, equipment, unit, etc. The hardware structure of the user terminal 400 or the base station 500 may include one or more devices shown in the figure, or may not include some devices.

For example, only one processor 610 is shown, but multiple processors may be used. In addition, processing may be performed by one processor, or by more than one processor simultaneously, sequentially, or by other methods. In addition, processor 610 may be implemented by more than one chip.

Each function in the user terminal 400 or the base station 500 is implemented, for example, in the following manner: by reading the specified software (program) into hardware such as the processor 610 and the memory 620, so that the processor 610 performs calculations, controls the communication performed by the communication device 640, and controls the reading and/or writing of data in the memory 620 and the storage 630.

The processor 610, for example, enables the operating system to operate and thereby controls the entire computer. The processor 610 may be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, a computing device, a register, etc. For example, the above-mentioned determination unit, receiving unit, etc. may be implemented by the processor 610.

In addition, the processor 610 reads the program (program code), software module, data, etc. from the storage 630 and/or the communication device 640 to the memory 620, and performs various processes according to them. As a program, a program that causes a computer to perform at least a part of the actions described in the above embodiments can be used. For example, the determination unit of the user terminal 400 can be implemented by a control program stored in the memory 620 and operated by the processor 610, and other functional blocks can also be implemented in the same way.

The memory 620 is a computer-readable recording medium, and may be composed of at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically programmable read-only memory (EEPROM), a random access memory (RAM), or other appropriate storage media. The memory 620 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 620 may store an executable program (program code), a software module, etc., for implementing the wireless communication method involved in one embodiment of the present invention.

The memory 630 is a computer-readable recording medium, and may be composed of at least one of a flexible disk, a floppy disk, a magneto-optical disk (e.g., a read-only disk (CD-ROM (Compact Disc ROM)), a digital versatile disk, a Blu-ray (registered trademark) optical disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a key driver), a magnetic stripe, a database, a server, and other appropriate storage media. The memory 630 may also be referred to as an auxiliary storage device.

The communication device 640 is hardware (transmitting and receiving device) for communicating between computers via a wired and/or wireless network, and is also called a network device, a network controller, a network card, a communication module, etc. The communication device 640 may include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to realize, for example, frequency division duplex (FDD) and/or time division duplex (TDD). For example, the above-mentioned transmitting unit, receiving unit, etc. may be realized by the communication device 640.

In addition, each device such as the processor 610 and the memory 620 is connected via a bus 650 for communicating information. The bus 650 may be composed of a single bus or different buses between devices.

In addition, the user terminal 400 or the base station 500 may include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc., and part or all of each functional block may be implemented by the hardware. For example, the processor 610 may be installed by at least one of these hardware.

(Variation Example)

In addition, the terms described in this specification and/or the terms required for understanding this specification can be interchanged with terms having the same or similar meanings. For example, a channel and/or a symbol can also be a signal (signaling). In addition, a signal can also be a message. A reference signal can also be referred to as RS (Reference Signal), and can also be referred to as a pilot (Pilot), a pilot signal, etc. depending on the applicable standard. In addition, a component carrier (CC) can also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

In addition, the information, parameters, etc. described in this specification may be expressed as absolute values, relative values to specified values, or other corresponding information. For example, wireless resources may be indicated by specified indexes. Furthermore, formulas using these parameters may also be different from those explicitly disclosed in this specification.

The names used for parameters and the like in this specification are not limiting in any respect. For example, various channels (Physical Uplink Control Channel (PUCCH), Physical Downlink Control Channel (PDCCH), etc.) and information elements may be identified by any appropriate names, and therefore the various names assigned to these various channels and information elements are not limiting in any respect.

The information, signals, etc. described in this specification may be represented by any of a variety of different technologies. For example, data, commands, instructions, information, signals, bits, symbols, chips, etc. that may be mentioned in the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

In addition, information, signals, etc. can be output from an upper layer to a lower layer, and/or from a lower layer to an upper layer. Information, signals, etc. can be input or output via multiple network nodes.

Input or output information, signals, etc. can be stored in a specific place (such as memory), or managed through a management table. Input or output information, signals, etc. can be overwritten, updated, or supplemented. Output information, signals, etc. can be deleted. Input information, signals, etc. can be sent to other devices.

The notification of information is not limited to the methods/implementations described in this specification, and may also be performed by other methods. For example, the notification of information may be implemented by physical layer signaling (e.g., downlink control information (DCI), uplink control information (UCI)), upper layer signaling (e.g., radio resource control (RRC) signaling, broadcast information (master information block (MIB), system information block (SIB), etc.), media access control (MAC) signaling), other signals or a combination thereof.

In addition, physical layer signaling may also be referred to as L1/L2 (Layer 1/Layer 2) control information (L1/L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling may also be referred to as RRC message, such as RRC Connection Setup message, RRC Connection Reconfiguration message, etc. In addition, MAC signaling may be notified, for example, by a MAC control unit (MAC CE (Control Element)).

Furthermore, notification of prescribed information (eg, notification of "is X") is not limited to being performed explicitly, and may be performed implicitly (eg, by not notifying the prescribed information, or by notifying other information).

The judgment can be made by a value represented by 1 bit (0 or 1), by a true or false value (Boolean value) represented by true (true) or false (false), or by comparing numerical values (for example, comparing with a specified value).

Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names, shall be interpreted broadly to refer to commands, sets of commands, codes, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, execution threads, steps, functions, etc.

In addition, software, commands, information, etc. can be sent or received via a transmission medium. For example, when software is sent from a website, server, or other remote resource using wired technology (coaxial cable, optical cable, twisted pair, digital subscriber line (DSL, Digital Subscriber Line), etc.) and/or wireless technology (infrared, microwave, etc.), these wired technology and/or wireless technology are included in the definition of transmission medium.

As used in this specification, the terms "system" and "network" are used interchangeably.

In this specification, the terms "base station (BS)", "wireless base station", "eNB", "gNB", "cell", "sector", "cell group", "carrier" and "component carrier" can be used interchangeably. Base stations are sometimes also referred to as fixed stations, NodeB, eNodeB (eNB), access points, transmission points, reception points, micro-micro cells, small cells, etc.

A base station can accommodate one or more (e.g., three) cells (also called sectors). When a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services through a base station subsystem (e.g., a small base station for indoor use (RRH, Remote Radio Head)). Terms such as "cell" or "sector" refer to a part or the entire coverage area of a base station and/or a base station subsystem that provides communication services in the coverage.

In this specification, the terms "mobile station (MS)", "user terminal", "user equipment (UE)" and "terminal" can be used interchangeably. Mobile station is sometimes also referred to by those skilled in the art as user station, mobile unit, user unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile user station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client or several other appropriate terms.

In addition, the wireless base station in this specification can also be replaced by a user terminal. For example, for a structure in which the communication between a wireless base station and a user terminal is replaced by the communication between multiple user terminals (D2D, Device-to-Device), the various methods/implementations of the present invention can also be applied. In this case, the functions of the above-mentioned user terminal 400 or base station 500 can be regarded as the functions of the user terminal. In addition, words such as "uplink" and "downlink" can also be replaced by "side". For example, the uplink channel can also be replaced by the side channel.

Likewise, the user terminal in this specification may also be replaced by a wireless base station. In this case, the functions of the user terminal described above may be regarded as the functions of the user terminal 400 or the base station 500.

In this specification, a specific action performed by a base station is sometimes performed by its upper node depending on the situation. Obviously, in a network composed of one or more network nodes having a base station, various actions performed for communication with a terminal can be performed by a base station, one or more network nodes other than the base station (for example, a mobile management entity (MME), a serving gateway (S-GW), etc., but not limited to this), or a combination thereof.

The various methods/implementations described in this specification may be used alone or in combination, and may be switched during execution. In addition, the processing steps, sequences, flow charts, etc. of the various methods/implementations described in this specification may be changed in order as long as there is no contradiction. For example, with respect to the methods described in this specification, various step units are given in an exemplary order, and are not limited to the specific order given.

The various modes and embodiments described in this specification can be applied to long term evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), super 3G, IMT-Advanced, 4G, 5G, future radio access (FRA), new radio access technology (New-RAT), new radio (NR), new radio access (NX), future generation radio access (FX), global system for mobile communications (GSM (registered trademark)), code division multiple access 4000 (CDMA 4000), ultra mobile broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems of other appropriate wireless communication methods, and/or next-generation systems expanded based on them.

The phrase "based on" used in this specification does not mean "only based on" unless otherwise specified in other paragraphs. In other words, the phrase "based on" means both "only based on" and "at least based on".

Any reference to a unit using the names "first", "second", etc. used in this specification does not fully limit the number or order of these units. These names may be used in this specification as a convenient method of distinguishing two or more units. Therefore, a reference to a first unit and a second unit does not mean that only two units can be used or that the first unit must precede the second unit in some form.

The term "determining" used in this specification sometimes includes a variety of actions. For example, with respect to "determining", calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database, or other data structure), ascertaining, etc. can be regarded as performing "determining". In addition, with respect to "determining", receiving (e.g., receiving information), transmitting (e.g., transmitting information), input, output, accessing (e.g., accessing data in a memory), etc. can also be regarded as performing "determining". In addition, with respect to "determining", resolving, selecting, choosing, establishing, comparing, etc. can also be regarded as performing "determining". That is, with respect to "determining", several actions can be regarded as performing "determining".

The terms "connected", "coupled" or any variation thereof used in this specification refer to any direct or indirect connection or combination between two or more units, and may include the following situations: there are one or more intermediate units between two units that are "connected" or "coupled" to each other. The combination or connection between units can be physical, logical, or a combination of the two. For example, "connect" can also be replaced by "access". When used in this specification, two units can be considered to be "connected" or "coupled" to each other by using one or more wires, cables, and/or printed electrical connections, and as several non-limiting and non-exhaustive examples, by using electromagnetic energy with wavelengths in the radio frequency region, microwave region, and/or light (both visible and invisible light) region, etc.

When the terms "including", "comprising", and their variations are used in this specification or claims, these terms are open ended like the term "having". Furthermore, the term "or" used in this specification or claims is not an exclusive or.

The present invention has been described in detail above, but it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented as a modification and variation without departing from the purpose and scope of the present invention as determined by the description of the claims. Therefore, the description of this specification is for the purpose of illustration and does not have any restrictive meaning for the present invention.

Claims (10)

1. A communication method, executed by a terminal, the method comprising: Receive information regarding modulation and coding from the base station; and Determine spreading parameters for the terminal according to the information about modulation and coding, wherein the spreading parameters are used by the terminal to spread symbols, The information about modulation and coding includes index information of modulation and coding strategies, and the determination of extended parameters for the terminal based on the information about modulation and coding includes: Extension parameters for the terminal are determined according to an index of the modulation and coding strategy and a first table, the first table includes a plurality of indexes and an extension parameter corresponding to each index, wherein the first table is determined by the following Determined by steps: Determine a spectrum efficiency set based on modulation parameters, coding parameters and candidate spreading parameters; selecting a predetermined number of spectral efficiencies from the set of spectral efficiencies; A plurality of spreading parameters included in the first table are obtained according to candidate spreading parameters corresponding to the predetermined number of spectral efficiencies to determine the first table. 2. The method of claim 1, further comprising: At least one of modulation parameters, coding parameters and spectral efficiency for the terminal is determined based on the information on modulation and coding. 3. The method of claim 2, wherein the spectral efficiency is determined based on modulation parameters, coding parameters and spreading parameters for the terminal. 4. The method of claim 1, wherein the extended parameters for the terminal are determined based on encoding parameters for the terminal. 5. The method of claim 4, further comprising: Updating coding parameters for the terminal according to extended parameters for the terminal. 6. A terminal, including: a receiving unit configured to receive information regarding modulation and coding from the base station; and a determining unit configured to determine spreading parameters for the terminal according to the information about modulation and coding, wherein the spreading parameters are used by the terminal to spread symbols, The information about modulation and coding includes index information of modulation and coding strategies, and the determination of extended parameters for the terminal based on the information about modulation and coding includes: Extension parameters for the terminal are determined according to an index of the modulation and coding strategy and a first table, the first table includes a plurality of indexes and an extension parameter corresponding to each index, wherein the first table is determined by the following Determined by steps: Determine a spectrum efficiency set based on modulation parameters, coding parameters and candidate spreading parameters; selecting a predetermined number of spectral efficiencies from the set of spectral efficiencies; A plurality of spreading parameters included in the first table are obtained according to candidate spreading parameters corresponding to the predetermined number of spectral efficiencies to determine the first table. 7. The terminal of claim 6, wherein the determining unit is further configured to determine at least one of modulation parameters, coding parameters and spectral efficiency for the terminal based on the information on modulation and coding. 8. The terminal of claim 7, wherein the spectral efficiency is determined based on modulation parameters, coding parameters and spreading parameters for the terminal. 9. The terminal of claim 6, wherein the extension parameters for the terminal are determined based on encoding parameters for the terminal. 10. The terminal of claim 9, further comprising: A processor configured to update encoding parameters for the terminal according to extended parameters for the terminal.